基于多模干涉的二维三角晶格光子晶体分束器

A two-dimensional triangulated photonic crystal beam splitter based on multimode interference

光分束器光接入系统的核心器件,是光子多功能设备和系统的关键构成模块,为满足急速增长的数据通信业务对光分束器的需求,本文在完整三角晶格光子晶体中引入五条平行光子晶体波导组成多模干涉系统,利用自成像效应的多模波导与微腔耦合,提出了一种新型二维三角晶格光子晶体四端口分束器。利用时域有限差分法进行仿真分析,结果表明:在一定范围内通过改变输出端四个耦合微腔内的介质柱半径,可以保证在分束器拥有较高的透射率的同时,且能实现输出能量的均分或在一定范围内的自由分配。

The beam splitter is the core component of the ultra-dense optical path forming system and the key component of the photon multifunctional equipment and system.In order to meet the needs of the rapidly increasing data communication services for optical beam splitters,five parallel photonic crystal waveguides are introduced into complete triangular photonic crystals to form a multi-mode interference system,and a new four-port beam splitter of two-dimensional triangular photonic crystals is proposed by coupling the multi-mode waveguide with the self-imaging effect and the microcavity.Finite difference time domain(FDTD)method is used for simulation analysis,and the results show that by changing the radius of the medium column in the four coupling microcavities at the output end,the beam splitter can have high transmittance and realize the average distribution of output energy or free distribution within a certain range.